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which many Mips 64 ABIs use than for O64 which many if not all other target ABIs use. Most architectures have the following 64 bit relocation record format: typedef struct { Elf64_Addr r_offset; /* Address of reference */ Elf64_Xword r_info; /* Symbol index and type of relocation */ } Elf64_Rel; typedef struct { Elf64_Addr r_offset; Elf64_Xword r_info; Elf64_Sxword r_addend; } Elf64_Rela; Whereas N64 has the following format: typedef struct { Elf64_Addr r_offset;/* Address of reference */ Elf64_Word r_sym; /* Symbol index */ Elf64_Byte r_ssym; /* Special symbol */ Elf64_Byte r_type3; /* Relocation type */ Elf64_Byte r_type2; /* Relocation type */ Elf64_Byte r_type; /* Relocation type */ } Elf64_Rel; typedef struct { Elf64_Addr r_offset;/* Address of reference */ Elf64_Word r_sym; /* Symbol index */ Elf64_Byte r_ssym; /* Special symbol */ Elf64_Byte r_type3; /* Relocation type */ Elf64_Byte r_type2; /* Relocation type */ Elf64_Byte r_type; /* Relocation type */ Elf64_Sxword r_addend; } Elf64_Rela; The structure is the same size, but the r_info data element is now 5 separate elements. Besides the content aspects, endian byte reordering will be different for the area with each element being endianized separately. I treat this as generic and continue to pass r_type as an integer masking and unmasking the byte sized N64 values for N64 mode. I've implemented this and it causes no affect on other current targets. This passes make check. Jack git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159299 91177308-0d34-0410-b5e6-96231b3b80d8
153 lines
4.7 KiB
C++
153 lines
4.7 KiB
C++
//===-- llvm/MC/MCELFObjectWriter.h - ELF Object Writer ---------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCELFOBJECTWRITER_H
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#define LLVM_MC_MCELFOBJECTWRITER_H
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#include "llvm/ADT/Triple.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/ELF.h"
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#include <vector>
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namespace llvm {
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class MCAssembler;
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class MCFixup;
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class MCFragment;
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class MCObjectWriter;
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class MCSymbol;
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class MCValue;
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/// @name Relocation Data
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/// @{
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struct ELFRelocationEntry {
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// Make these big enough for both 32-bit and 64-bit
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uint64_t r_offset;
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int Index;
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unsigned Type;
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const MCSymbol *Symbol;
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uint64_t r_addend;
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const MCFixup *Fixup;
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ELFRelocationEntry()
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: r_offset(0), Index(0), Type(0), Symbol(0), r_addend(0), Fixup(0) {}
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ELFRelocationEntry(uint64_t RelocOffset, int Idx, unsigned RelType,
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const MCSymbol *Sym, uint64_t Addend, const MCFixup &Fixup)
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: r_offset(RelocOffset), Index(Idx), Type(RelType), Symbol(Sym),
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r_addend(Addend), Fixup(&Fixup) {}
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// Support lexicographic sorting.
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bool operator<(const ELFRelocationEntry &RE) const {
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return RE.r_offset < r_offset;
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}
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};
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class MCELFObjectTargetWriter {
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const uint8_t OSABI;
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const uint16_t EMachine;
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const unsigned HasRelocationAddend : 1;
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const unsigned Is64Bit : 1;
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const unsigned IsN64 : 1;
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protected:
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MCELFObjectTargetWriter(bool Is64Bit_, uint8_t OSABI_,
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uint16_t EMachine_, bool HasRelocationAddend,
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bool IsN64=false);
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public:
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static uint8_t getOSABI(Triple::OSType OSType) {
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switch (OSType) {
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case Triple::FreeBSD:
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return ELF::ELFOSABI_FREEBSD;
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case Triple::Linux:
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return ELF::ELFOSABI_LINUX;
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default:
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return ELF::ELFOSABI_NONE;
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}
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}
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virtual ~MCELFObjectTargetWriter() {}
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virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
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bool IsPCRel, bool IsRelocWithSymbol,
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int64_t Addend) const = 0;
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virtual unsigned getEFlags() const;
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virtual const MCSymbol *ExplicitRelSym(const MCAssembler &Asm,
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const MCValue &Target,
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const MCFragment &F,
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const MCFixup &Fixup,
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bool IsPCRel) const;
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virtual void adjustFixupOffset(const MCFixup &Fixup,
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uint64_t &RelocOffset);
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virtual void sortRelocs(const MCAssembler &Asm,
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std::vector<ELFRelocationEntry> &Relocs);
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/// @name Accessors
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/// @{
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uint8_t getOSABI() { return OSABI; }
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uint16_t getEMachine() { return EMachine; }
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bool hasRelocationAddend() { return HasRelocationAddend; }
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bool is64Bit() const { return Is64Bit; }
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bool isN64() const { return IsN64; }
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/// @}
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// Instead of changing everyone's API we pack the N64 Type fields
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// into the existing 32 bit data unsigned.
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#define R_TYPE_SHIFT 0
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#define R_TYPE_MASK 0xffffff00
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#define R_TYPE2_SHIFT 8
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#define R_TYPE2_MASK 0xffff00ff
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#define R_TYPE3_SHIFT 16
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#define R_TYPE3_MASK 0xff00ffff
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#define R_SSYM_SHIFT 24
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#define R_SSYM_MASK 0x00ffffff
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// N64 relocation type accessors
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unsigned getRType(uint32_t Type) const {
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return (unsigned)((Type >> R_TYPE_SHIFT) & 0xff);
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}
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unsigned getRType2(uint32_t Type) const {
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return (unsigned)((Type >> R_TYPE2_SHIFT) & 0xff);
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}
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unsigned getRType3(uint32_t Type) const {
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return (unsigned)((Type >> R_TYPE3_SHIFT) & 0xff);
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}
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unsigned getRSsym(uint32_t Type) const {
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return (unsigned)((Type >> R_SSYM_SHIFT) & 0xff);
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}
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// N64 relocation type setting
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unsigned setRType(unsigned Value, unsigned Type) const {
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return ((Type & R_TYPE_MASK) | ((Value & 0xff) << R_TYPE_SHIFT));
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}
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unsigned setRType2(unsigned Value, unsigned Type) const {
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return (Type & R_TYPE2_MASK) | ((Value & 0xff) << R_TYPE2_SHIFT);
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}
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unsigned setRType3(unsigned Value, unsigned Type) const {
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return (Type & R_TYPE3_MASK) | ((Value & 0xff) << R_TYPE3_SHIFT);
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}
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unsigned setRSsym(unsigned Value, unsigned Type) const {
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return (Type & R_SSYM_MASK) | ((Value & 0xff) << R_SSYM_SHIFT);
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}
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};
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/// \brief Construct a new ELF writer instance.
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///
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/// \param MOTW - The target specific ELF writer subclass.
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/// \param OS - The stream to write to.
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/// \returns The constructed object writer.
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MCObjectWriter *createELFObjectWriter(MCELFObjectTargetWriter *MOTW,
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raw_ostream &OS, bool IsLittleEndian);
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} // End llvm namespace
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#endif
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